harmony 鸿蒙Flex

  • 2022-08-09
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Flex

The <Flex> component allows for flexible layout of child components.

NOTE

  • This component is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.
  • The <Flex> component adapts the layout of flex items during rendering. This may affect the performance. Therefore, you are advised to use <Column> or <Row> instead under scenarios where consistently high performance is required.
  • If the main axis of the <Flex> component is not set, it follows the size of the parent container. On the contrary, if the main axis of the <Column> or <Row> component is not set, it follows the size of their child component.

Child Components

Supported

APIs

Flex(value?: { direction?: FlexDirection, wrap?: FlexWrap, justifyContent?: FlexAlign, alignItems?: ItemAlign, alignContent?: FlexAlign })

Creates a standard <Flex> component. For details, see Flex Layout.

Since API version 9, this API is supported in ArkTS widgets.

Parameters

Name Type Mandatory Default Value Description
direction FlexDirection No FlexDirection.Row Direction in which child components are arranged in the <Flex> component, that is, the direction of the main axis.
wrap FlexWrap No FlexWrap.NoWrap Whether the <Flex> component has a single line or multiple lines.
NOTE
When wrapped onto multiple lines, the child elements on the new line are stacked in the direction based on the cross axis direction.
justifyContent FlexAlign No FlexAlign.Start Alignment mode of the child components in the <Flex> component along the main axis.
alignItems ItemAlign No ItemAlign.Start Alignment mode of the child components in the <Flex> component along the cross axis.
alignContent FlexAlign No FlexAlign.Start Alignment mode of the child components in a multi-row <Flex> component along the cross axis. This parameter is valid only when wrap is set to Wrap or WrapReverse.

Example

Example 1

// xxx.ets
@Entry
@Component
struct FlexExample1 {
  build() {
    Column() {
      Column({ space: 5 }) {
        Text('direction:Row').fontSize(9).fontColor(0xCCCCCC).width('90%')
        Flex({ direction: FlexDirection.Row }) { // The child components are arranged in the same direction as the main axis runs along the rows.
          Text('1').width('20%').height(50).backgroundColor(0xF5DEB3)
          Text('2').width('20%').height(50).backgroundColor(0xD2B48C)
          Text('3').width('20%').height(50).backgroundColor(0xF5DEB3)
          Text('4').width('20%').height(50).backgroundColor(0xD2B48C)
        }
        .height(70)
        .width('90%')
        .padding(10)
        .backgroundColor(0xAFEEEE)

        Text('direction:RowReverse').fontSize(9).fontColor(0xCCCCCC).width('90%')
        Flex({ direction: FlexDirection.RowReverse }) { // The child components are arranged opposite to the Row direction.
          Text('1').width('20%').height(50).backgroundColor(0xF5DEB3)
          Text('2').width('20%').height(50).backgroundColor(0xD2B48C)
          Text('3').width('20%').height(50).backgroundColor(0xF5DEB3)
          Text('4').width('20%').height(50).backgroundColor(0xD2B48C)
        }
        .height(70)
        .width('90%')
        .padding(10)
        .backgroundColor(0xAFEEEE)

        Text('direction:Column').fontSize(9).fontColor(0xCCCCCC).width('90%')
        Flex({ direction: FlexDirection.Column }) { // The child components are arranged in the same direction as the main axis runs down the columns.
          Text('1').width('100%').height(40).backgroundColor(0xF5DEB3)
          Text('2').width('100%').height(40).backgroundColor(0xD2B48C)
          Text('3').width('100%').height(40).backgroundColor(0xF5DEB3)
          Text('4').width('100%').height(40).backgroundColor(0xD2B48C)
        }
        .height(160)
        .width('90%')
        .padding(10)
        .backgroundColor(0xAFEEEE)

        Text('direction:ColumnReverse').fontSize(9).fontColor(0xCCCCCC).width('90%')
        Flex({ direction: FlexDirection.ColumnReverse }) { // The child components are arranged opposite to the Column direction.
          Text('1').width('100%').height(40).backgroundColor(0xF5DEB3)
          Text('2').width('100%').height(40).backgroundColor(0xD2B48C)
          Text('3').width('100%').height(40).backgroundColor(0xF5DEB3)
          Text('4').width('100%').height(40).backgroundColor(0xD2B48C)
        }
        .height(160)
        .width('90%')
        .padding(10)
        .backgroundColor(0xAFEEEE)
      }.width('100%').margin({ top: 5 })
    }.width('100%')
  }
}

en-us_image_0000001219744189

Example 2

// xxx.ets
@Entry
@Component
struct FlexExample2 {
  build() {
    Column() {
      Column({ space: 5 }) {
        Text('Wrap').fontSize(9).fontColor(0xCCCCCC).width('90%')
        Flex({ wrap: FlexWrap.Wrap }) { // The child components are arranged in multiple lines, and they may overflow.
          Text('1').width('50%').height(50).backgroundColor(0xF5DEB3)
          Text('2').width('50%').height(50).backgroundColor(0xD2B48C)
          Text('3').width('50%').height(50).backgroundColor(0xD2B48C)
        }
        .width('90%')
        .padding(10)
        .backgroundColor(0xAFEEEE)

        Text('NoWrap').fontSize(9).fontColor(0xCCCCCC).width('90%')
        Flex({ wrap: FlexWrap.NoWrap }) { // The child components are arranged in a single line, and they cannot overflow.
          Text('1').width('50%').height(50).backgroundColor(0xF5DEB3)
          Text('2').width('50%').height(50).backgroundColor(0xD2B48C)
          Text('3').width('50%').height(50).backgroundColor(0xF5DEB3)
        }
        .width('90%')
        .padding(10)
        .backgroundColor(0xAFEEEE)

        Text('WrapReverse').fontSize(9).fontColor(0xCCCCCC).width('90%')
        Flex({ wrap: FlexWrap.WrapReverse , direction:FlexDirection.Row }) { // The child components are reversely arranged in multiple lines, and they may overflow.
          Text('1').width('50%').height(50).backgroundColor(0xF5DEB3)
          Text('2').width('50%').height(50).backgroundColor(0xD2B48C)
          Text('3').width('50%').height(50).backgroundColor(0xD2B48C)
        }
        .width('90%')
        .height(120)
        .padding(10)
        .backgroundColor(0xAFEEEE)
      }.width('100%').margin({ top: 5 })
    }.width('100%')
  }
}

en-us_image_0000001174264366

Example 3

// xxx.ets
@Component
struct JustifyContentFlex {
  justifyContent : number = 0;

  build() {
    Flex({ justifyContent: this.justifyContent }) {
      Text('1').width('20%').height(50).backgroundColor(0xF5DEB3)
      Text('2').width('20%').height(50).backgroundColor(0xD2B48C)
      Text('3').width('20%').height(50).backgroundColor(0xF5DEB3)
    }
    .width('90%')
    .padding(10)
    .backgroundColor(0xAFEEEE)
  }
}

@Entry
@Component
struct FlexExample3 {
  build() {
    Column() {
      Column({ space: 5 }) {
        Text('justifyContent:Start').fontSize(9).fontColor(0xCCCCCC).width('90%')
        JustifyContentFlex({ justifyContent: FlexAlign.Start }) // The child components are aligned with the start edge of the main axis.

        Text('justifyContent:Center').fontSize(9).fontColor(0xCCCCCC).width('90%')
        JustifyContentFlex({ justifyContent: FlexAlign.Center }) // The child components are aligned in the center of the main axis.

        Text('justifyContent:End').fontSize(9).fontColor(0xCCCCCC).width('90%')
        JustifyContentFlex({ justifyContent: FlexAlign.End }) // The child components are aligned with the end edge of the main axis.

        Text('justifyContent:SpaceBetween').fontSize(9).fontColor(0xCCCCCC).width('90%')
        JustifyContentFlex({ justifyContent: FlexAlign.SpaceBetween }) // The child components are evenly distributed along the main axis. The first component is aligned with the main-start, the last component is aligned with the main-end.

        Text('justifyContent:SpaceAround').fontSize(9).fontColor(0xCCCCCC).width('90%')
        JustifyContentFlex({ justifyContent: FlexAlign.SpaceAround }) // The child components are evenly distributed along the main axis. The space between the first component and main-start, and that between the last component and cross-main are both half the size of the space between two adjacent components.

        Text('justifyContent:SpaceEvenly').fontSize(9).fontColor(0xCCCCCC).width('90%')
        JustifyContentFlex({ justifyContent: FlexAlign.SpaceEvenly }) // The child components are evenly distributed along the main axis. The space between the first component and main-start, the space between the last component and main-end, and the space between any two adjacent components are the same.
      }.width('100%').margin({ top: 5 })
    }.width('100%')
  }
}

en-us_image_0000001174582854

Example 4

// xxx.ets
@Component
struct AlignItemsFlex {
  alignItems : number = 0;

  build() {
    Flex({ alignItems: this.alignItems }) {
      Text('1').width('33%').height(30).backgroundColor(0xF5DEB3)
      Text('2').width('33%').height(40).backgroundColor(0xD2B48C)
      Text('3').width('33%').height(50).backgroundColor(0xF5DEB3)
    }
    .size({width: '90%', height: 80})
    .padding(10)
    .backgroundColor(0xAFEEEE)
  }
}

@Entry
@Component
struct FlexExample4 {
  build() {
    Column() {
      Column({ space: 5 }) {
        Text('alignItems:Auto').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignItemsFlex({ alignItems: ItemAlign.Auto }) // The items in the container are aligned with the cross-start edge.

        Text('alignItems:Start').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignItemsFlex({ alignItems: ItemAlign.Start }) // The items in the container are aligned with the cross-start edge.

        Text('alignItems:Center').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignItemsFlex({alignItems: ItemAlign.Center}) // The items in the container are centered along the cross axis.

        Text('alignItems:End').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignItemsFlex({ alignItems: ItemAlign.End }) // The items in the container are aligned with the cross-end edge.

        Text('alignItems:Stretch').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignItemsFlex({ alignItems: ItemAlign.Stretch }) // The items in the container are stretched and padded along the cross axis.

        Text('alignItems:Baseline').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignItemsFlex({ alignItems: ItemAlign.Baseline }) // The items in the container are aligned in such a manner that their text baselines are aligned along the cross axis.
      }.width('100%').margin({ top: 5 })
    }.width('100%')
  }
}

en-us_image_0000001174422904

Example 5

// xxx.ets
@Component
struct AlignContentFlex {
  alignContent: number = 0;

  build() {
    Flex({ wrap: FlexWrap.Wrap, alignContent: this.alignContent }) {
      Text('1').width('50%').height(20).backgroundColor(0xF5DEB3)
      Text('2').width('50%').height(20).backgroundColor(0xD2B48C)
      Text('3').width('50%').height(20).backgroundColor(0xD2B48C)
    }
    .size({ width: '90%', height: 90 })
    .padding(10)
    .backgroundColor(0xAFEEEE)
  }
}

@Entry
@Component
struct FlexExample5 {
  build() {
    Column() {
      Column({ space: 5 }) {
        Text('alignContent:Start').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignContentFlex({ alignContent: FlexAlign.Start }) // The child components are aligned with the start edge in the multi-row layout.

        Text('alignContent:Center').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignContentFlex({ alignContent: FlexAlign.Center }) // The child components are aligned in the center in the multi-row layout.

        Text('alignContent:End').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignContentFlex({ alignContent: FlexAlign.End }) // The child components are aligned with the end edge in the multi-row layout.

        Text('alignContent:SpaceBetween').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignContentFlex({ alignContent: FlexAlign.SpaceBetween }) // In the multi-row layout, the child component in the first row is aligned with the start edge of the column, and the child component in the last row is aligned with the end edge of the column.

        Text('alignContent:SpaceAround').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignContentFlex({ alignContent: FlexAlign.SpaceAround }) // In the multi-row layout, the space between the child component in the first row and the start edge of the column, and that between the child component in the last row and the end edge of the column are both half the size of the space between two adjacent rows.

        Text('alignContent:SpaceEvenly').fontSize(9).fontColor(0xCCCCCC).width('90%')
        AlignContentFlex({ alignContent: FlexAlign.SpaceEvenly}) // In the multi-row layout, the space between the child component in the first row and the start edge of the column, the space between the child component in the last row and the end edge of the column, and the space between any two adjacent rows are the same.
      }.width('100%').margin({ top: 5 })
    }.width('100%')
  }
}

en-us_image_0000001174422906

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